The issue is caused by https://github.com/godotengine/godot/pull/64306 which makes use of a 3.7 feature while the current recommended python version is 3.5 for 3.x and 3.6 for master.
(cherry picked from commit 667f4ed742e0010adb678dff45e004310c4886d4)
Modules can now call:
env.module_add_dependencies(name: str, deps: list, optional: bool)
To add required or optional dependencies during the "can_build" step.
Required dependencies will be checked and the module will be not be
enabled when they are missing, printing a warning to notify the user.
- Faless
951a1016d3
This is still a bit hacky and eventually we should rework the way we handle
optional dependencies (especially with regard to builtin/system libs), but
it's a simple first step.
- akien-mga
7c74312217